TC1796
System Units (Vol. 1 of 2)
Watchdog Timer
User’s Manual 16-30 V2.0, 2007-07
WDT, V2.0
WDTLCK 1rwLock Bit to Control Access to WDT_CON0
0
B
Register WDT_CON0 is unlocked.
1
B
Register WDT_CON0 is locked
(default after reset).
The actual value of WDTLCK is controlled by
hardware. It is set to 0 after a successful Password
Access to WDT_CON0, and automatically set to 1
again after a successful Modify Access to
WDT_CON0. During a write to WDT_CON0, the
value written to this bit is only used for the password-
protection mechanism and is not stored.
This bit must be set to 0 during a Password Access to
WDT_CON0, and set to 1 during a Modify Access to
WDT_CON0. That is, the inverted value read from
WDTLCK always must be written to itself.
WDTHPW0 [3:2] w Hardware Password 0
This bit field must be written with the value of the bits
WDT_CON1.WDTDR and WDT_CON1.WDTIR
during a Password Access.
This bit field must be written with 0’s during a Modify
Access to WDT_CON0. When read, these bits always
return 0.
WDTHPW1 [7:4] w Hardware Password 1
This bit field must be written to 1111
B
during both, a
Password Access and a Modify Access to
WDT_CON0. When read, these bits always return 0.
WDTPW [15:8] rw User-Definable Password Field for Access to
WDT_CON0
This bit field must be written with its current contents
during a Password Access. It can be changed during
a Modify Access to WDT_CON0.
WDTREL [31:16] rw Reload Value for the WDT
If the WDT is enabled and in Normal Timer Mode, it
will start counting from this value after a correct
Watchdog service. This bit field must be written with
its current contents during a Password Access. It can
be changed during a Modify Access to WDT_CON0
(FFFC
H
= default after reset).
Field Bits Type Description
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